Dockerfile.squashfs-tools

FROM alpine:latest AS build
ARG SQUASHFS_TOOLS_VERSION=4.6.1
WORKDIR /usr/src

# build dependencies
RUN apk update && apk add build-base git zlib-dev zlib-static zstd-dev zstd-static lz4-dev lz4-static

# check out squashfs-tools sources
ENV SQUASHFS_TOOLS_VERSION=${SQUASHFS_TOOLS_VERSION}
RUN git clone https://github.com/plougher/squashfs-tools && cd squashfs-tools && git checkout squashfs-tools-$SQUASHFS_TOOLS_VERSION
WORKDIR /usr/src/squashfs-tools/squashfs-tools
ENV CFLAGS="-O2 -Wall -static"
ENV LDFLAGS="-static"
RUN make -j`nproc` && make install INSTALL_DIR=/usr/obj/usr/bin

## copy final squashfs-tools into a scratch image
FROM scratch AS final
COPY --from=build /usr/obj/ /